Tubular anchoring member

ABSTRACT

A tubular anchoring member, such as a dowel, an expansion bolt or the like for mounting in a bored hole and for cooperating with a screw, a bolt or a similar fastening member and having at one end a collar or flange connected to the said end of the tubular member by means of one or more breakable connecting parts. The said connecting part or parts extend(s) radially beyond the cross section of the tubular member and the inner edge of the collar or flange encircles an annular uncovered area of said cross section. When the tubular member is mounted in a bored hole in a wall with the flange abutting the outer surface thereof the flange or collar may conveniently be separated from the tubular member by exerting a pressure or a blowing action to the exposed or uncovered annular part of the end of the tubular member by means of a suitable tool.

United States Patet Martensen [54] TUBULAR ANCHORING MEMBER [72]Inventor: Louis Aackersb erg Mortensen, Petersholm Hillerdvej 1, 3480Fredensborg, Denmark [22] Filed: Feb. 6, 1970 [21] Appl. No.: 9,276

[ 51 Feb. 15,1972

FOREIGN PATENTS OR APPLICATIONS 498,826 1/1939 Great Britain ..85/72908,912 10/1962 Great Britain ..ss/s2 1,354,587 1/1964 France ..85/83Primary Examiner-Marion Parsons, Jr. AnorneyCushman, Darby & CushmanABSTRACT A tubular anchoring member, such as a dowel, an expansion boltor the like for mounting in a bored hole and for cooperating with ascrew, a bolt or a similarfastening member and having ayone end a collaror flange connected to the said end of the tubular member by means ofone or more breakable connecting parts. The said connecting part orparts extend(s) radially beyond the cross section of the tubular memberand the inner edge of the collar or flange encircles an annularuncovered area of said cross section. When the tubular member is mountedin a bored hole in a wall with the flange abutting the outer surfacethereof the flange or collar may conveniently be separated from thetubular member by exerting a pressure or a blowing action to the exposedor uncovered annular part of the end of the tubular member by means of asuitable tool.

5 Claims, 10 Drawing Figures PATENTEDFEB15 ma 3.641 .866

SHEET 2 OF 2 FIGB. A

3 ATTORNEYS TUBULAR ANCHORING MEMBER BACKGROUND OF THE INVENTION 1.Field of the Invention.

The invention relates to a tubular anchoring member of the type intendedfor mounting in a bored hole and for cooperating with a screw, a bolt,or a similar fastening member.

Typical examples of such anchoring members to which the inventionrelates, are the various types of wall screw anchors, or dowels, as wellas sleeves or sleevelike parts used in connection with or constitutingparts of the so-called expansion bolts. The said tubular anchoringmembers may be with or without axial slits and may be made from metal,plastic, or other suitable materials.

When an anchoring member of the above-mentioned type is to be mounted ina bored hole in most cases it is desired that in the mounted conditionof the anchoring member the outmost end thereof is fairly made flushwith the outer surface of the material in which the hole is bored, forexample the outer surface of a wall or a plate. If the hole has beenmade a little oversized in relation to the outer diameter of theunexpanded anchoring member the said member is very easily moved too farinto the hole if not provided with an abutting flange. Thereby in manycases the efficiency of the anchoring member is reduced unless the screwor bolt belonging to the anchoring member is replaced by a longer one.Furthermore, sometimes when the anchoring member is pushed too far intothe bored hole there is a risk that the anchoring member falls down intoan inaccessible wall cavity and thus becomes lost. In certain cases,however, it is desired to position the anchoring member at an arbitraryposition along the axis of the bored hole. As an example, when mountinga door frame in a wall opening holes are bored through the door frameand into the wall. Then an anchoring member is pushed so deeply into thebored hole that it is positioned within the wall where the anchoringshould take place, and then the anchoring operation is performed therebythat a relatively long screw is led into the bored hole and screwed intothe anchoring member.

2. Description of the Prior Art.

In order to reduce the number of types of anchoring members which thedealers have to stock in order to cover the various needs it has for along time been desired to produce a flanged tubular anchoring memberwhich may when necessary, easily be modified by the user in such amanner that it may be pushed into the bored hole to any desired depth.Tubular plastic anchoring members which may be modified as described,are known. The flange of said known anchoring member is connected to oneend of the tubular member by means of a number of spaced, axiallyextending connecting parts forming a continuation of the wall ofthetubular member and being connected to the side of the annular flangefacing said member and the inner diameter of the flange is equal to thediameter of the inscribed circular cylinder of the tubular member. Thus,by the known anchoring member the annular flange and the connectingparts define a cylindrical hole forming a direct continuation of theaxial bore of the tubular member. If the said known anchoring member isto be mounted deeply in a bored hole the flange must initially beremoved by cutting or shearing the connecting parts, for example bymeans ofa wire cutter.

SUMMARY OF THE INVENTION Generally the invention relates to an anchoringmeans intended for mounting in a bored hole and comprising a collar orflange connected to one end portion of a tubular member by means of oneor more breakable connecting means, and the object of the invention isto provide an anchoring means the flange of which may be removed in avery simple manner without using cutting and shearing tools.

According to the invention the connecting means extend beyond thecircumscribed circular cylinder of said end portion of the tubularmember and the diameter of the inscribed circle of said collar or flangeexceeds the diameter of the inscribed circular cylinder ofthe endportion of the tubular member.

If the anchoring means according to the invention is to be mounteddeeper in the bored hole than allowed by the flange the anchoring meansmay be pushed into the bored hole in the normal manner till the collaror flange prevent further insertion. Due to the fact that the diameterof the inscribed circle of the flange is greater than the diameter ofthe inscribed circular cylinder of the end portion of the tubular memberan annular part of the end surface of the tubular member will be exposedand this uncovered end part is now subjected to pressure or a slightblowing action. This may for example be performed thereby that the headof a screw belonging to the anchoring means is placed against theexposed annular end surface part whereafter a pressure or a slight blowis dealt to the opposite end of the screw, for example by means of ahammer or another blowing tool. Thereby the tubular member and theflange will be actuated in opposite directions and due to the fact thatthe interjacent connecting means extend radially beyond the crosssection of the end portion of the anchoring means the breakableconnecting means will be subjected to bending or shearing. Thus, theflange may easily be separated from the tubular member provided that theconnecting means are suitably dimensioned.

According to the invention the diameter of the inscribed circle of thecollar or flange may exceed the diameter of the said circumscribedcylinder of the end portion of the tubular member, and the connectingmeans may be circumferentially spaced connecting webs extending radiallyand substantially at right angles to the longitudinal axis of thetubular member. By this embodiment the whole end surface of the tubularmember is uncovered and therefore it is particularly simple to subjectthe said end surface to the above mentioned blowing action. Furthermore,the fact that the connecting webs extend across an annular space betweenthe end of the tubular member and the flange has the effect that thewebs are easily cut by the mutual axial displacement taking placebetween the flange and the tubular member when the last mentioned ispushed or blown inwardly. The embodiments described above have a furtheradvantage when the anchoring member is of the type adapted to besubstantially radially expanded when a belonging screw or anotherbelonging fastening member is mounted. The reason is that due to theinterjacent webs the more stiff collar or flange will not prevent theradial expansion of the tubular member at the end thereof provided withthe flange.

According to the invention each of said connecting webs may comprise aroot portion being connected to said tubular member and having a crosssection being increased in relation to that of the adjacent webportions. Thereby is obtained that the connecting means will not be cutright at the outer periphery of the tubular member. The outwardlyextending root parts remaining on the tubular member will contribute toincrease the friction between the tubular member and the wall of thebored hole. This is especially advantageous in cases where the boredhole has been slightly oversized in relation to the cross section of theanchoring member.

According to the invention said connecting part may be an annular parthaving a thickness being reduced in relation to the adjacent flangeparts. When the exposed end of the tubular member of this embodiment issubjected to an axial blow as explained above the flange will be cut atthe position where the thickness thereof is reduced.

BRIEF DESCRIPTION OF THE DRAWING The invention will be further explainedwith reference to the drawing, wherein FIG. 1 is a bottom view of anembodiment of the anchoring member according to the invention,

FIG. 2 is an axial section along the line IIII in FIG. 1,

FIG. 3 is a bottom view of another embodiment of the anchoring memberaccording to the invention,

FIG. 4 is an axial section corresponding to that shown in FIG. 2, but ofthe embodiment shown in FIG. 3,

FIG. 5 is a screw anchoring member according to the invention and of thetype being radially expandable along the whole length thereof,

FIG. 6 illustrates a method for removing the collar or flange from atubular member according to the invention mounted in a bored hole,

FIG. 7 is a side view and partial section view ofa portion of a doorframe mounted in an opening in a wall by using the anchoring memberaccording to the invention, and

FIGS. 8-10 are axial sections corresponding to those shown in FIGS. 2and 4, but of further embodiments of the anchoring member according tothe invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS.

FIGS. 1 and 2 show an anchoring member or anchoring sleeve 10representing all types of tubular anchoring members adapted to bemounted in a bored hole in order to permit fastening or anchoring of ascrew, a bolt, or a similar fastening member. At one of its ends thesleeve 10 is provided with an annular collar or flange 11 the innerdiameter of which is greater than the outer diameter or the diameter ofthe circumscribed circular cylinder of the adjacent end of the member orsleeve 10 so that an annular space 12 is formed between the sleeve andthe flange. The collar or flange 11 is fastened to the outer surface ofthe sleeve 10 by means of mutually spaced, radially extending connectingwebs 13.

In the embodiment shown in FIGS. 3 and 4 the annular flange I1 isconnected to the tubular member or sleeve 10 by means of an annularconnecting part 14 having a smaller wall thickness than the mere flangeor collar ll.

FIG. 5 shows a screw anchoring member 15 of the type adapted to beexpanded along its full length by screwing in a wooden screw. Due to thefact that an annular space 12 is present between the flange 11 and themember 15 the flange will not prevent expansion of the end of theanchoring member to which the flange is connected.

FIG. 6 illustrates the tubular member or sleeve shown in FIGS. I and 2placed in a hole 16 bored in a wall 17. In most cases it is desired tohave the flange ll abut the outer wall surface 18 as shown. Sometimes,however, it is desired to remove the flange 11 from the sleeve 10, forexample when the sleeve is to be moved further into the hole 16. Thisremoval of the flange 11 may be performed thereby that the sleeve 10 issubjected to a pressure or a slight blowing action in the directionindicated by the arrow 19. As an example, the head of a screw 20 may beplaced so as to abut the sleeve end as shown whereafter the opposite endof the screw may be subjected to a blow by a hammer or another tool.Then the connecting webs 13 will be sheared due to the shearing stressto which they are subjected. The flange of the embodiment shown in FIGS.3 and 4 may be removed in a similar manner.

FIGS. 8, 9 and 10 show various other embodiments of the anchoring memberaccording to the invention where the flange 1 1 is axially spaced fromthe adjacent end surface of the tubular member or sleeve 10 and wherethe connecting webs 13 extend in directions inclined in relation to thelongitudinal axis of the anchoring member. In FIG. 8 the collar orflange l 1 covers part of the adjacent end surface of the sleeve, and inFIG. 8 as well as in FIG. 9 the connecting webs are connected to theperipheral outer surface of the sleeve. In FIG. 10, however, theconnecting webs are connected to the end surface of the sleeve.

As explained previously, for example when fastening a door frame in awall opening by the use of screw anchoring members it is required toremove possible flanges thereon, the anchoring members have to bepositioned deeply in the bored holes. FIG. 7 shows such a door frame 21which is mounted in an opening 22 of a wall 23. The outer dimensions ofthe door frame 21 are normally somewhat smaller than the correspondingdimensions of the door opening, and therefore the door frame isinitially fastened within the opening 22 by means of wooden wedges 24.Thereafter holes 25 are bored through the frame 21 and into the wall 23and then anchoring members or sleeves according to the invention may bemounted in the holes 25 as shown at the bottom of FIG. 7 and in such amanner that the flange ll of the sleeve abut the inner side of the frame21. The flange I! may now be separated from the sleeve 10 thereby thatthe mere sleeve is pushed or blown inwardly into the bored hole 25. Thismay for example be performed by using a screw 26 which may either beplaced as the screw 20 in FIG. 6, or the point of the screw may be ledinto the sleeve I0 as shown at the bottom of FIG. 7 whereafter the screwis subjected to a blowing action in the direction indicated by the arrow19. The anchoring sleeve 10 may then be pushed right to the bottom ofthe hole 25 in the wall 23 whereafter the screw 26 may be screwed up inthe sleeve as shown at the top of FIG. 7. By using an anchoring memberor sleeve 10 of the type shown in FIGS. 1, 2 and 5 where the root of theconnecting webs 13 is strengthened these roots 27, FIG. 7, will remainon the sleeve after removal of the flange II and thus be effective afriction increasing members assisting in preventing that the sleeverotates within the hole 25 when screwing up the screw 26.

It is understood that various modifications of the embodiments shown onthe drawing may be made within the scope of the invention. As an exampleit may be mentioned that the connecting webs 13 need not extendradially. Furthermore, it should be noted that the outer and inner edgesof the collar or flange 11 need not necessarily be circular.

What I claim is:

1. An anchoring means intended for mounting in a bored hole, saidanchoring means comprising:

a tubular expandable member for receiving a fastening device designed tocause expansion of said expandable member in said bored hole,

an annular collar or flange, and

breakable connecting means connecting said annular flange to one endportion of said tubular expandable member,

said breakable connecting means extending radially beyond the outsidediameter of said end portion, to permit separation of said flange fromsaid tubular member by breakage of said connecting means and tofacilitate expansion of said tubular member even if the flange remainsattached, and wherein,

the inside diameter of said annular collar or flange exceeds the insidediameter of said end portion of the tubular member whereby the innerperiphery of the annular collar or flange encircles an exposed annulararea of the adjacent end of the tubular member to facilitate breakage ofthe connecting means by selective application of force on said exposedannular area after insertion of said tubular member into the bored hole.

2. An anchoring means as in claim 1, wherein:

the inside diameter of the collar or flange exceeds the outside diameterof the said end portion of the tubular member, and

said connecting means are circumferentially spaced, connecting websextending radially and substantially at right angles to a longitudinalaxis of the tubular member.

3. An anchoring means as in claim 2, wherein each of said connectingwebs comprises a root portion connected to said end portion of thetubular member and having a cross section that is greater than that ofother web portions adjacent said root portion.

4. An anchoring means as in claim 1, wherein said connecting means is anannular part of the collar or flange, said annular part having athickness that is less than the adjacent flange parts.

5. An anchoring means as in claim 1 wherein said tubular expandablemember comprises a screw fastening or anchoring device.

1. An anchoring means intended for mounting in a bored hole, saidanchoring means comprising: a tubular expandable member for receiving afastening device designed to cause expansion of said expandable memberin said bored hole, an annular collar or flange, and breakableconnecting means connecting said annular flange to one end portion ofsaid tubular expandable member, said breakable connecting meansextending radially beyond the outside diameter of said end portion, topermit separation of said flange from said tubular member by breakage ofsaid connecting means and to facilitate expansion of said tubular membereven if the flange remains attached, and wherein, the inside diameter ofsaid annular collar or flanGe exceeds the inside diameter of said endportion of the tubular member whereby the inner periphery of the annularcollar or flange encircles an exposed annular area of the adjacent endof the tubular member to facilitate breakage of the connecting means byselective application of force on said exposed annular area afterinsertion of said tubular member into the bored hole.
 2. An anchoringmeans as in claim 1, wherein: the inside diameter of the collar orflange exceeds the outside diameter of the said end portion of thetubular member, and said connecting means are circumferentially spaced,connecting webs extending radially and substantially at right angles toa longitudinal axis of the tubular member.
 3. An anchoring means as inclaim 2, wherein each of said connecting webs comprises a root portionconnected to said end portion of the tubular member and having a crosssection that is greater than that of other web portions adjacent saidroot portion.
 4. An anchoring means as in claim 1, wherein saidconnecting means is an annular part of the collar or flange, saidannular part having a thickness that is less than the adjacent flangeparts.
 5. An anchoring means as in claim 1 wherein said tubularexpandable member comprises a screw fastening or anchoring device.